Improvement in stop-valves



S. P. M. TASKER.

Improvement in Stop-Valves.

Patented July 9, 1872.

FIG. a

mw, wam nInlay/www to, my. /assnR//f's PRocEssJ lessee NI i IMPROVEMENT IN STQP-VALVES.

Specification forming part of Letters Patent No. 128,923, dated July 9, 18772.

sphere with the exception of a dat portion, tov

which the screw is connected.

I am aware that various means have been used for closing duplicate disks on opposite seats by either sliding them forward or, by a` merely lateral movement, outwardly of each disk, the disks at the Sametime keeping apositive lateral position with each other, neither disk being at all times free to keep its parallelism with its seat when the other disk has been raised at one point by dirt or other material getting between the face of the disk and seat.

My inventiomby means of the spherical form `of the wedge and the eounter-form of the connecting parts of the disks, admits of either disk turning in any direction freely on the connecting side of the wedge, when anything gets between the face of the disk and the valveseat, without turning the other disk from its parallel position with its seat; and hence one of the disks or valves may be calculated upon in performing its function when the other is deranged, so as to keep up an effectual operation of the valve at all times.

Figure 1 is a longitudinal section of the improved valve. Fig. 2 is an end view of the box A and disks E E, the central piece B being removed. Fig. 3 is a longitudinal section of the same at right angles to Fig. 1. Figs.

4, 5, and 6 are a face and two edge views of the spherical Wedge F. Figs. 7 and 8 are views at right angles to each other of a modified form of the wedge F.

Like letters in all the figures indicate the same parts.

A is the valvebox. B is the center piece connected with the projection b of the box A. It has a central screw-nut, d, and stalling-box C, through which the screwstem D works for closing the disks E E upon their seats e e. The screw-stem D is provided with a spherical wedge, F, which is connected with the spher ical inclines f f of the disks E E, so thatwhen the hand-wheel G, on the outer end of the screwy stem D, is turned in the direction of the arrows,

the wedge in its forward movement, by pressing upon the inclines f f of the disks, closes them upon their seats e e, as seen in Fig. l. By a reversed movement of the screw-stem D the wedge F is drawn into the space g and away from the-inclines f f, and thus admits of the opening of the disks from their seats. I have represented the spherical wedge F as if the middle portion of the section of a sphere were taken out and the outside portions brought together. It may, however, if desired, have the whole section of a sphere, as shown in Figs. 7 and 8; but I prefer the form represented in Figs. 4, 5, and 6. By the wedge being made of spherical form either disk may be tilted by dirt getting on its seat without disturbing the normal condition of the other.

I claim as my invention- The spherical wedge F, constructed substantially as described, operated by suitable meehanism for closing two opposite disks upon their seats, the said disks having counter spherical inclines combined with the wedge, substantially as described.

y 'STEPHEN P. M. TASKER. y

Witnesses:

STEPHEN UsTrcK, THOMAS J. BEWLEY. 

